As nations all over the world commemorate the symbolic birth of the seven billionth human being, National Geographic announces 7 Billion, an app that explores the impact of the new world population on a world with limited resources.
Downloadable for free from iTunes, 7 Billion showcases informative videos, interactive maps, in-depth articles, and stunning photography that aim to highlight and quantify the trends and effects that surround this milestone in human population growth.
Featured content include the following information on the world population:

In 2045 there will be 9 billion people
Every second 5 people are born
Every second 2 people die (you can see the problem)
We’re all living longer: the average Life span is now 69 years old
By 2050, 70% of us will be living in urban areas
We have enough space for all these people: 7 billion people could fit shoulder-to-shoulder in the City of Los Angeles
In 1975 there were three mega-cities (cities with 10 million or more people); today there are 21 mega-cities